47502721 has 4 divisors (see below), whose sum is σ = 54288832. Its totient is φ = 40716612.

The previous prime is 47502691. The next prime is 47502731. The reversal of 47502721 is 12720574.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 47502721 - 2⁹ = 47502209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47502721.

It is not an unprimeable number, because it can be changed into a prime (47502731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3393045 + ... + 3393058.

It is an arithmetic number, because the mean of its divisors is an integer number (13572208).

Almost surely, 2^47502721 is an apocalyptic number.

It is an amenable number.

47502721 is a deficient number, since it is larger than the sum of its proper divisors (6786111).

47502721 is an equidigital number, since it uses as much as digits as its factorization.

47502721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6786110.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 47502721 is about 6892.2217753058. The cubic root of 47502721 is about 362.1647373484.

The spelling of 47502721 in words is "forty-seven million, five hundred two thousand, seven hundred twenty-one".